Improvement in safety-valves



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UNITED STATES PATENT OFFICE D. G. COPPIN AND G. H. CLEMENS, OFCINCINNATI, OHIO.

IMPROVEMENT IN SA FETY-VALVES.

Specification forming part of Letters Patent No. 58,987, dated October23, 1866.

To all whom it may concern:

Be it known that we, 1). G. 001mm and G. H. CLEMENS, of Cincinnati,Hamilton county, and State of Ohio, have invented a new and usefulImprovement in Non-Tamperin g Safety- Valves, of which the following isa full and clear description, reference being had to the accompanyingdrawings, making part of this specification.

Our improvement in safety-valves relates to the shrouding a series ofweights which rest upon levers that bear down upon the valve,effectually preventing tampering with the valve.

Figure 1 is an elevation of the shrouding or easing of the valve securedto the top ofa boiler. Fig. 2 represents a plan of the casing of thevalve. Fig. 3 is a plan of the lower section of the casing of the valve,the valve, valveseat ring, and levers resting upon the valve. Fig. at isa vertical section through the boiler, valve, valve-seat ring, levers,weights, and easing of the valve.

A is a boiler having perforation a. To boiler A is bolted the casing Bot'our non-tampering safety-valve. (lasingB isin two sections. The lowersection, b, is made fast to the boiler by bolts 1) the upper section,c,is bolted to lower section, b, by bolts 0". An opening in the top ofupper scction,c, passes through huh (I. The annular flange c, on theinside of lower section, 1), near the bottom, is provided for theannular ringf, which contains the valve-seat. Annular ring f is boltedto flange 0. Valve U is provided with a number of guides, g, projectingfrom its lower face. A tubular continuation ofthe upper part of thevalve 0 has perfora tions h, whose area is equal to that of thevalve-opening. The tubular continuation of valve U terminates in thedisk is, upon the of which rest the levers I. These levers lare pivotedto lugs l, which project from the inner surface of lower section, b. Atube,m, is tapped into the tubular :ontiuuation of valve (3, andterminates in sleeve n. Sleeve 02 is a short tube fitting steam-tightthe hub d from its inner surface, and at its lower end projects inwardthe annular flange n. A corresponding flange, m, projects from the upper.end of tube m, fitting steam-tight the sleeve 92. A perforated cap, 0,covers and is made fast to sleeve n.

A series of weights, I), perforated in their centers, rest upon leversI. The tube at passes through these weights. The upper weight, D, isprovided with an annular ring, 11, of rubber, having a diameter lessthan the largest diameter of hub d. \Veight D has its upper surfacedish-shaped.

Operation Thedesired weight being placed upon the valve, and the valveat rest upon the valve-seat, as shown in Fig. 4, will so remain until anexcess of pressure forces the valve from its seat. The edge I." of theupper portion of the valve U presses the lovers 1, upon the free ends ofwhich rest the series of weights D. The weights rise until theannularring p, which acts as a cushion, comes in contact with the hub (Z. Inthe meantime the steam escapes through perforations it into tube m andfinally through the perforated cap 0. The excess of pressure havingbecnthrown oil, the valve 0 reseats itself. 'By increasing the length oflevers l or the diameter of disk k, which terminates the tubularcontinuation of valve 0, a greater pressure may be brought to bear uponthe valve, which may be still further increased by filling thedish-shaped upper surface of weight I) with lead or other heavymaterial.

The perforation in cap 0 serves two purposesfor the escape of steam andthe insertion ofa hook to raise the valve from its seat at intervals,and thus ascertain whether or not the valve is held in its seat by anaccumulation of sediment around it.

From the above description it will be seen that the valve cannot beloaded by designing persons.

Having fully described our improved safetyvalve, its operation, andadvantage over those in general use, we make the following claims, whichwe desire to secure by Letters Patent:

1. The valve 0 and tube at, constructed as above described, and for thepurpose set forth.

2. The valve 0, levers I, and weights D and D, arranged as abovedescribed, and for the purpose set forth.

3. The valve 0, lovers 1, weights D and D, and tube m,in combinationwith annular ringf, casin g B, sleeve n, and cap 0, for the purposeabove described and set forth.

DANIEL Gr. COPPIN. GILBERT H. CLEMENS.

Attest:

Unknnns L. FISHER, WM. U. MAHON.

